January 01, 2017

Triple-Mode Ceramic Cavity Filters With Wide Spurious-Free Performance

  • Abbosh A.
  • Hendry D.

A triple-mode silver-plated ceramic cavity filter with wide spurious-free response is presented. It uses single mode ceramic slabs as interfacing resonators with the cube to give wide spurious-free performance up to 4 GHz for an 1800-MHz base station filter. Three square apertures at the slab-cube interface give simple and flexible control of transmission zero placement while maintaining low insertion loss. The parallel nature of the slab-to-cube coupling allows a simple cuboid structure without chamfers or intermode coupling elements. A seven-pole filter in the DCS-1800 transmit band is built using a slab-slab-cube-slab-slab structure and measured. Along with wide spurious-free performance, the filter achieves around 1 dB of band edge insertion loss with more than 50 dB of attenuation, 20 MHz from the band edges, and from an 11-cm³ package. The near band performance shows all of the seven poles in the return loss. The insertion loss is 1.1 dB on the low side (1805 MHz), 1.0 dB on the high side (1880 MHz), and 0.6 dB at the band center. The wideband response shows more than 40 dB of attenuation up to the frequency 3.7 GHz.

View Original Article

Recent Publications

August 09, 2017

A Cloud Native Approach to 5G Network Slicing

  • Francini A.
  • Miller R.
  • Sharma S.

5G networks will have to support a set of very diverse and often extreme requirements. Network slicing offers an effective way to unlock the full potential of 5G networks and meet those requirements on a shared network infrastructure. This paper presents a cloud native approach to network slicing. The cloud ...

August 01, 2017

Modeling and simulation of RSOA with a dual-electrode configuration

  • De Valicourt G.
  • Liu Z.
  • Violas M.
  • Wang H.
  • Wu Q.

Based on the physical model of a bulk reflective semiconductor optical amplifier (RSOA) used as a modulator in radio over fiber (RoF) links, the distributions of carrier density, signal photon density, and amplified spontaneous emission photon density are demonstrated. One of limits in the use of RSOA is the lower ...

July 12, 2017

PrivApprox: Privacy-Preserving Stream Analytics

  • Chen R.
  • Christof Fetzer
  • Le D.
  • Martin Beck
  • Pramod Bhatotia
  • Thorsten Strufe

How to preserve users' privacy while supporting high-utility analytics for low-latency stream processing? To answer this question: we describe the design, implementation and evaluation of PRIVAPPROX, a data analytics system for privacy-preserving stream processing. PRIVAPPROX provides three properties: (i) Privacy: zero-knowledge privacy (ezk) guarantees for users, a privacy bound tighter ...